Kites ________ messages in the war in the past.

The meeting ___________ because of the smog in Northern China last week.— Oh, it’s too bad! We should take action to improve the air quality.

We should leave the classroom ____ the light____.

This box is ______ heavy ________ I can’tcarry it.

What the doctors really doubt is ____ my mother will recover from the serious disease soon[ ]